They got a new POS, and whoever installed it stole the working Ethernet port. I plugged the POS into our router and whitelisted it (00:03:81:e5:ba:ae).
They emailed because they had to unplug the wifi router in order to get their POS machine working. I whitelisted it (00:0b:4f:52:e5:50) in /etc/wifidog.conf and now it's working.
The node has been down for a long while; Sandy emailed to ask for help to get it up again. I went by in the afternoon. It seems like they've added Rogers phone service since the last time I was there. In the shuffle, the ethernet cable between the cable modem and the router was unplugged. I plugged it back in, and everything came right back.
Jon and Gabe installed this router today.